Thursday, April 29, 2021

Acids, Bases and Salts | Class 10 | Activity 2.11 with Solution

Activity 2.11
  • Test the pH values of solutions given in Table 2.2.
  • Record your observations.
  • What is the nature of each substance on the basis of your observations?

Solution

Colour of pH paper

Approximate pH value

Nature of substance

1.    Saliva (before meal)




2.    Saliva (after meal)




3.    Lemon juice




4.    Colourless aerated drink




5.    Carrot juice




6.    Coffee




7.    Tomato juice




8.    Tap water




9.    1M NaOH




10. 1M HCl





✅ Answer:

Solution

Colour of pH paper

Approximate pH value

Nature of substance

1.    Saliva (before meal)

Green

6.8 – 7.4

Slightly acidic to basic

2.    Saliva (after meal)

Yellow green

5.8

Acidic

3.    Lemon juice

Orange

2.2

Acidic

4.    Colourless aerated drink

Yellow

4.0

Acidic

5.    Carrot juice

Yellow green

6.0

Acidic

6.    Coffee

Yellow

4.5

Acidic

7.    Tomato juice

Yellow

4.3

Acidic

8.    Tap water

Green

6 – 8.5

Varied

9.    1M NaOH

Dark blue

14

Basic

10. 1M HCl

Red

0

Acidic


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